iPhone AVPlayer从PhoneGap中的远程URL流 [英] iPhone AVPlayer Streaming from Remote URL in PhoneGap

问题描述

我们正在使用一个用Obj-C编写的PhoneGap插件在iPhone应用程序中从远程URL获取音频流。由于某些原因，它不通过扬声器播放音频，它只通过耳机播放。我们试过使用AVAudioPlayer没有运气。我需要将音频输出设置在某个地方吗？

We are working on getting audio streaming from a remote URL in a iPhone application using a PhoneGap plugin written in Obj-C. For some reason, it is not playing the audio through the speakers, it only plays through headphones. We've tried using AVAudioPlayer with no luck. Do I need to set the audio output somewhere?

--CharStream.m--

#import "CharStream.h"
#import "AppDelegate.h"

@implementation CharStream

-(CDVPlugin*) initWithWebView:(UIWebView*)theWebView {
    self = (CharStream*)[super initWithWebView:theWebView];
    return self;
}

-(void) loadPlaylist:(NSArray*)arguments withDict:(NSMutableDictionary *)options {
    //currentSong = 0;
    //playlist = [[arguments objectAtIndex:currentSong] objectFromJSONString];
    item = [[AVPlayerItem playerItemWithURL:[NSURL URLWithString:@"http://music.clayfreeman.com/music/Hybrid%20Minds%20-%20Inner%20Beauty.m4a"]] retain];
    [item addObserver:self forKeyPath:@"playbackBufferEmpty" options:0 context:nil];
    [item addObserver:self forKeyPath:@"status" options:0 context:nil];
    player = [[AVPlayer alloc] initWithPlayerItem:item];
    [player addObserver:self forKeyPath:@"status" options:0 context:nil];
    NSLog(@"Loading song.");
}

-(void) play:(NSArray*)arguments withDict:(NSMutableDictionary *)options {
    [self play];
}

-(void) play {
    [player play];
}

-(void) pause:(NSArray*)arguments withDict:(NSMutableDictionary *)options {
    [player pause];
}

-(void) nextSong:(NSArray*)arguments withDict:(NSMutableDictionary *)options {
    [self nextSong];
}

-(void) nextSong {
    currentSong++;
    item = [[AVPlayerItem playerItemWithURL:[NSURL URLWithString:[playlist objectAtIndex:currentSong]]] retain];
    [item addObserver:self forKeyPath:@"status" options:0 context:nil];
    [item addObserver:self forKeyPath:@"playbackBufferEmpty" options:0 context:nil];
    player = [AVPlayer playerWithPlayerItem:item];
}

-(void) observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    if ([object isKindOfClass:[AVPlayerItem class]]) {
        AVPlayerItem* changedItem = (AVPlayerItem *)object;
        if ([keyPath isEqualToString:@"playbackBufferEmpty"]) {
            [item removeObserver:self forKeyPath:@"playbackBufferEmpty"];
            [self nextSong];
            NSLog(@"Song over. Moving to next item.");
        } else if ([keyPath isEqualToString:@"status"]) {
            if (changedItem.status == AVPlayerItemStatusFailed) {
                [item removeObserver:self forKeyPath:@"status"];
                [self nextSong];
                NSLog(@"Item failed. :( Moving to next item.");
            } /*else if (changedItem.status == AVPlayerItemStatusReadyToPlay) {
                [self play];
                NSLog(@"Item is ready to play.");
            }*/
        }
    } else if ([object isKindOfClass:[AVPlayer class]]) {
        AVPlayer* playerLol = (AVPlayer *) object;
        if ([keyPath isEqualToString:@"status"]) {
            if (playerLol.status == AVPlayerStatusReadyToPlay) {
                [self play];
            }
        }
    }
}

@end


--CharStream.h--

#import <AVFoundation/AVFoundation.h>

#ifdef CORDOVA_FRAMEWORK
#import <Cordova/CDVPlugin.h>
#else
#import "CDVPlugin.h"
#endif

@interface CharStream : CDVPlugin {
    NSMutableArray* playlist;
    AVPlayerItem* item;
    int currentSong;
    AVPlayer* player;
}

-(CDVPlugin*) initWithWebView:(UIWebView*)theWebView;
-(void)loadPlaylist:(NSArray*)arguments withDict:(NSMutableDictionary*)options;
-(void)pause:(NSArray*)arguments withDict:(NSMutableDictionary*)options;
-(void)play:(NSArray*)arguments withDict:(NSMutableDictionary*)options;
-(void)play;
-(void)nextSong:(NSArray*)arguments withDict:(NSMutableDictionary*)options;
-(void)nextSong;

@end


--CharStream.js--
function CharStream() {
    this.init = true;
};

CharStream.prototype.loadPlaylist = function(array, options) {
    Cordova.exec("CharStream.loadPlaylist", array, options);
};

CharStream.prototype.pause = function(options) {
    Cordova.exec("CharStream.pause", options);
};

CharStream.prototype.play = function(options) {
    Cordova.exec("CharStream.play", options);
};

CharStream.prototype.nextSong = function(options) {
    Cordova.exec("CharStream.nextSong", options);
};

Cordova.addConstructor(function() 
{
    if(!window.plugins)
    {
        window.plugins = {};
    }
    window.plugins.CharStream = new CharStream();

});

推荐答案

设置音频会话很重要，例如因此：

It is important to set up your audio session, like so:

AVAudioSession *audioSession = [AVAudioSession sharedInstance];
BOOL ok;
NSError *setCategoryError = nil;
ok = [audioSession setCategory:AVAudioSessionCategoryPlayback
                         error:&setCategoryError];
if (!ok) {
  NSLog(@"%s setCategoryError=%@", __PRETTY_FUNCTION__,
        setCategoryError);
  return;
}
NSError *activationError = nil;
ok = [audioSession setActive:YES error:&activationError];
if (!ok) {
  NSLog(@"%s activationError=%@", __PRETTY_FUNCTION__,
             activationError);
  return;
}
// The audio session is OK and ready for playback.

这篇关于iPhone AVPlayer从PhoneGap中的远程URL流的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！